Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d94df05f4fafb1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 05:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52cc6753a60bd330f04721f9c9e7779c SHA-1: c31d682436642fee8ac63ee7ef1cfa68408ce88b SHA-256: d7d94df05f4fafb16baa416ce7f767b3c07bcb4b0b5d56da09d7cb5045f0a728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://daotaolaixesontay.com/uploads/file/43799351318.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/11334079867.pdfIn PDF document text
    • http://soles2walk.cz/data/file/vitezabunewovoj.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/wozamobexaxodakaxiwatoz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612421fc8058c---73574805766.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h59n4e5ick5thr2aqft5hq9bv6/gajufaluku.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/basujiwolepamojogabatewo.pdfIn PDF document text
    • https://eclearusa.com/images/file/85411017277.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/78231658550.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e936f608115d12858542bdc886f985d8/151301156.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b75cc467f0f5ec5a73e1c3097ca6568e/55195802369.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/sabalozadulagab.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160922f6b31087---95224186457.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/79429068659.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/xopexixo.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/guvojejalivef.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88a1e4287---kozetalo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u4rvs45oc2emhik3dsne5v5ocm/fusijabebutupufiresu.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/wagomedezivifozinonewi.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/c2f6c5eb73830d9cdeb379ed7f0bc86d/6255684552.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/pexiwipatakavuxizudikad.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/96652942808.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc224418e---mebogamefedunarivoj.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/nitofunotibupojoponinomo.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/zovafidut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=power+semiconductor+drives+lecture+notes+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 15924 bytes
SHA-256: f40512321f60395873cc65d4331c86b5efe7b1917553bd40502ae054756c8504
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 10872 bytes
SHA-256: d2108b189d3908a049112dea7b4b8e5afb348b4935987cb1fd4ea829d2a7352e

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